Comparison of Speech Eecognition with Digital Remote Microphone and Adaptive FM System by Hearing Aid Users

• Main Authors: WU, YEN-FEN, 吳彥玢
• Other Authors: LIU, TIEN-CHEN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/pv55hd

碩士 === 國立臺北護理健康大學 === 語言治療與聽力研究所 === 107 === The goal of this study was to compare the speech recognition between digital remote microphone and adaptive FM system in combination with hearing aids for hearing-impaired patients by using subjective and objective measurements. The objective measures employed was Mandarin Hearing in Noise Test for use in Taiwan (MHINT-T) in quiet and noise while subjective measurement was a sound quality scale which consists of six questions including sound quality, naturalness, clarity, comfort, noise and self-confidence. In this study, 12 participants with an average age of 37.91 years were enrolled. The average hearing threshold was 63.96 dB HL (SD=18.84) for the right ear and 63.23 dB HL (SD =14.82) for the left. ALL subjects received MHINT-T under 3 conditions: use hearing aid only (HA only), a hearing aid with a dynamic frequency modulation system (HA+FM), and a hearing aid with a digital remote microphone (HA+digital RM). In the quiet listening situation. The averaged speech reception threshold are : 44.21 dBA (SD=4.72) for HA only, 42.78 dBA (SD=5.27) for HA+ FM, and 42.62 dBA (SD=5.45) for HA+digital RM respectively. There is no significant differences among 3 groups. In the noise listening situation, the average RTS is -3.90 dB (SD=4.08) for HA only, -8.75 dB (SD = 2.97) for HA +FM, -10.45dB (SD=3.71) for HA + digital FM. The difference reaches statistical significance (HA+digital RM better than HA+ FM and HA only). The results of objective evaluation showed that there were no significant differences in sound quality, naturalness, comfort, and self-confidence between HA+FM and HA+digital RM (P >.05), in terms of clarity and noise. The total score of HA+digital RM is significantly higher than HA+FM. This study showed that the subject wearing hearing aid with a remote microphone can effectively improve the listening performance under noisy listening environment, especially the digital remote microphone, which can significantly improve the signal-to-noise ratio. However, in quiet, there is no significant difference in wearing a hearing aid alone or with these two remote microphone devices. In addition to the objective measures, the digital remote microphone has a better clarity, noise, and the total score is than the frequency modulation system based on the subjective questionnaire. In summary, the digital RM in combination with hearing aid offers the best perforation of speech in noise for these patients with hearing loss. The effectiveness is better than traditional FM plus hearing aid and hearing aid alone. However, the benefit of the remote microphone system (digital RM or FM) was not shown in the quiet listening conditions.